Means for imparting a radial movement to the cutting-tools of a rotary head



(No Model.)

P. A. WHITNEY. MEANS FOR IMPARTING A RADIAL MOVEMENT TO THE CUTTINGTOOLS OF A ROTARY HEAD.

Avfeafar,

N. PETERS, Pholciilhoguphur, Wazhmglan, Dv C.

UNITED STATES PATENT QFFICE.

PARDON A. WHITNEY, OF SOUTI-UNGTON, CONNECTICUT.

MEANS FOR IMPARTING A RADIAL MOVEMENT TO THE CUTTING-TOOLS OF A ROTARYHEAD.

SPECIFICATION forming part of Letters Patent No. 398,481, dated February26, 1889. Application filed October 26, 1888. Serial No. 289,202. (Nomodel.)

To all whom, it may concern:

Be it known that I, PARDON A. \VHITNEY, a citizen of the United States,residing at Southington, in the county of Hartford and State ofConnecticut, have invented certain new and useful Improvements inMilling-Machines, of which the following is a specification.

My invention relates to improvements in milling-machines of the class inwhich the tools move radially and cut from the periphery of the workinward in contradistinction to that class of machines in which the toolscut from the end of the work and move len gthwise thereon.

The object of my invention is to render the action of the feedingmechanism automatic and regular.

In the accompanying drawings, Figurel is a longitudinal section, partlyin elevation, of my milling-machine on line an of Fig. 2. Fig. 2 is atransverse section thereof on line 3 y of Fig. 1. Fig. 3 is a frontelevation of said machine. Fig. 4 is a longitudinal section, partly inelevation, of a portion of my machine, showing a modification; and Fig.5 is a f rout elevation thereof.

6 designates a piece of work illustrated in Fig. 1 as being milled by mymachine; but 1 have not illustrated the chuck for holding the work, asit may be held and advanced to the milling-tools by any known mechanism.

A designates the frame of my machine, having mounted within suitablebearings the main shaft 7, to the front end of which is attached thehead 8. This head is of an ordinary construction, and, as shown in Figs.1 and 3, is provided with four radial slots, in each of which arearranged an outer and inner pair of lever-jaws, 9 and 10, the outer endsof which jaws are provided with radiallymoving milling-tools 11, of anyordinary construction. The tools within the inner leverjaws, 9, areadapted to mill a tenon on the end of the work, and the tools in theleverjaws 10 are adapted to mill a groove at an other point of the work,leaving a shouldered portion of a larger diameter between the milledportions, as illustrated in Fig. l. The rear ends of the lever-jaws 9 10are provided with friction-rollers 12, which are acted upon by the cam13 to throw the rear ends of the jaws outward and their front endsinward. The lever-jaws are thrown in the opposite direction by means ofsprings 1a and 15.

16 designates a pulley on the main shaft, which is driven by the belt17, as in ordinary milling-machines.

At the rear end of the main shaft 7 there is a gear-wheel, 18, whichmeshes into a like gear-wheel, 19, on the counter-shaft 20, which shafthas also attached another gear-wl1eel, 21, that meshes into a gearwheel,66, on the rear end of the sleeve 67. The cam 13 is attached to theouter end of said sleeve, so as to revolve therewith. The main shaft 7eX- tends through said sleeve; but they are not keyed together and aretherefore capable of revolving on a common axis at diiferent speeds. Thedifferential gear-wheels which drive the sleeve and cam are so timed asthat the cam revolves either a little slower or a little faster than themain shaft, whereby the lever-jaws will be operated by said cam to movethe tools 11 inward at regular intervals while the cam and head are bothrevolving, but at slightly varying speeds. The relative speed of the camand the head will vary according to the work to be performed.

As illustrated, there are sixty-five teeth in each of the gear-wheels18, 19, and 21 and sixty-six teeth in the wheel 66. Thus it will be seenthat the cam loses one revolution for every sixty-six revolutions of themain shaft, and therefore. a four-lift cam, as shown, will operate tomove the lever-jaws four times for every sixtysix revolutions of themain shaft or once for every sixteen and one-half revolutions. When itdesired to have the cam lose or gain one revolution for a less number ofrevolutions of the main shaft, the differential gear-wheels may bedifferently timedas, for instance, the gear-wheel 18 may be providedwith seventeen teeth, the gear-wheel 19 with nineteen teeth, and thegeanwheels 21 and 66 with some like number of teethas, for instance,eighteen each-and then the cam will lose about one revolution for everyten revolutions of the main shaft. These two examples of timing thedifferential gearwheels are believed to be all that is necessary toillustrate the general plan of their operation.

I have illustrated the cam as a double cam for acting upon an outer andinner set of lever-jaws; but it is obvious that a single cam might beemployed for acting upon a single set of jaws; or, in other words, whenjaws for acting upon one pointof the work only are desired the jaws foracting upon another part of the work may be omitted without making anydiiference in the operation of the jaws which remain. It is also evidentthat the cam may have any desired number of shoulders or lifts, as Ihave called them, instead of being a four-lif t cam, as shown, thenumber of lifts being determined by the character of the work to bedone. I have also illustrated the head 8 as carrying four tools, 11, ineach set of lever-jaws; butthe numberof tools and jaws for acting uponany one point of the work isnot essential.

In Figs. 4: and 5 I show only one pair of tools, 22, approaching thework from opposite sides. Instead of mounting these tools in lever-jawsI arrange them in sliding jaws 23,

which move diametrically within the head 8 in a dovetailed slot or way,and said sliding jaws are provided with friction-rollers 12, to be actedupon by a cam, as before described. If desired, instead of moving thejaws inward by a spring a grooved cam, 2%, may be em ployed, as shown inFigs. at and 5, so that the tools may be moved both outward and inwardby the cam instead of being moved inward by a cam and outward by aspring, as first described. I11 both forms of the machine the milledwork is to be taken from between the milling-tools and new'work replacedin the machine when the cam and springs or the grooved cam have movedthe milling-tools outwardly. IVith the lever-jaws as in Figs. 1, 2, and3, the milling-tools are thrown out when the rollers 12 are resting onthe lowest points of the cam, while with sliding jaws, as in Figs. 4:and 5, the milling-tools are thrown outwhen the rollers 12 are on thehighest points of the cam.

I claim as my invention- The combination of the main shaft, the headsecured thereon. and carrying radiallymoving milling-tools, the cam formoving said tools, mounted to revolve on a common axis with said shaftand head, and the differential gear-wheels for driving said cam at adifferent rate of speed from that of said shaft, subsjantially asdescribed, and for the. purpose

